Add "Ability to remove a fork relationship on a project" as a customizable permission

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Problem to solve

This issue has been raised when capturing the deltas in permissions between Owner and Maintainer. Owner has this permission, but Maintainer does not. Adding this as a customizable permission helps our customers lessen their reliance on the extremely privileged Owner role, and gives them flexibility when creating new roles to give them only the permissions that they need.

Proposal

Add "Ability to remove a fork relationship on a Project" as a customizable permission using the customizable roles framework.

Edited by 🤖 GitLab Bot 🤖